Nausea? Or just gagging??

Agatha
Hey guys!
I'll be 6weeks tomorrow and I've been gagging all morning. I can't tell if this is nausea or what? I've been nauseous before in my life lol, but this feel different somehow. More like a lump in the throat, gagging sensation. Can anyone relate? Is this the start of pregnancy nausea? Thanks! 
Xxx